But now, upcoming episode The Story and The Engine teases yet another dangerous threat: "The Spider and its deadly web of revenge." But what exactly does that mean?
"There are stakes in the Spider for the Doctor… that's all I can say," he explained. "There are stakes in this story. The Spider hasn’t just come out of nowhere. There are stakes in each other's success and failures."
Nonetheless, Ellams insisted: "It's something completely new, nothing like you've ever seen before," seemingly ruling out the possible return of another familiar villain.
"Storytelling is how the men let each other into their most intimate spaces, but it’s also what powers friendship across the world, but also specifically in barbershops.
"It is the locomotion that deepens relations. It is everywhere; it is how we make friends. But in the barbershop, it is heightened."
"The Doctor and Belinda’s relationship really deepens in this episode," he added.
Doctor Who is available to stream on BBC iPlayer. New episodes release weekly on Saturdays.
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